EP2577989A1 - Haut-parleur acoustique - Google Patents
Haut-parleur acoustiqueInfo
- Publication number
- EP2577989A1 EP2577989A1 EP11730722.3A EP11730722A EP2577989A1 EP 2577989 A1 EP2577989 A1 EP 2577989A1 EP 11730722 A EP11730722 A EP 11730722A EP 2577989 A1 EP2577989 A1 EP 2577989A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- winding
- loudspeaker
- coil
- magnetic field
- acoustic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004804 winding Methods 0.000 claims abstract description 25
- 230000005236 sound signal Effects 0.000 claims abstract description 3
- 239000004020 conductor Substances 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims description 3
- 238000013016 damping Methods 0.000 description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000004584 weight gain Effects 0.000 description 1
- 235000019786 weight gain Nutrition 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
- H04R2209/043—Short circuited voice coils driven by induction
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
Definitions
- the invention relates to the field of acoustic loudspeakers. It is more particularly a loudspeaker equipped with arrangements allowing it to provide adjustment in the field of low frequencies, and more specifically bass sounds.
- the reproduction of bass sounds is a major element in the assessment of the quality of an audio system.
- the quality of listening depends on one hand on the ability of an amplifier to reproduce these serious sounds, but on the other hand, performances of the speaker which themselves are, as far as the bass is concerned, dependent on the room in which the loudspeaker is located.
- the size and geometry of the room can have an influence, to the extent that, at the frequencies considered in the bass, the amount of air displaced by the speaker diaphragm is important.
- the wavelengths are such that the phenomena of reflection can cause the appearance of nodes and wavelengths which make that, depending on the location of the user, the sound quality can be very variable.
- a particular loudspeaker has been described in DE 195 28 904.
- This loudspeaker comprises a second winding mounted on the moving element and in the magnetic field of the loudspeaker magnet. This coil is short-circuited, and protects the speaker against over-currents and excessive vibrations.
- the problem to be solved by the invention is therefore to allow adjustment in the low frequency band, without causing significant changes to the surrounding frequencies, without requiring complex or expensive installation.
- the invention therefore relates to an acoustic loudspeaker which comprises:
- - Mobile equipment including a membrane, a coil adapted to be traversed by an electric current representative of the sound signal to be generated, and to interact with this constant magnetic field, and a second coil also located in the magnetic field.
- this loudspeaker is characterized in that the two terminals of the second winding are connected by a substantially resistive component, selected from a set of resistive elements of distinct resistance values, by means of ensuring the connecting one of these elements to the terminals of the second winding.
- a substantially resistive component selected from a set of resistive elements of distinct resistance values, by means of ensuring the connecting one of these elements to the terminals of the second winding.
- These means may be particularly varied, and it may for example be a set of jumpers or even multi-position buttons that connect the most appropriate resistance.
- the loudspeaker is equipped with a coil in short circuit or closed circuit on a resistor, which moves in the magnetic field as the main coil, and which is therefore the seat of induced currents that dissipate by effect Joule in the resistive element connected to its terminals.
- the damping factor (or Qms) of the loudspeaker is adjusted so as to ensure optimum coupling between the volume of the listening room and the loudspeaker volume.
- the complementary winding which is in practice associated with the main winding in which the control current flows, is the seat of a counter electromotive force which tends to prevent the coil from moving in the gap.
- the second coil has a volume of conductive material substantially identical to that of the main coil.
- substantially equal volumes it is meant that the difference between the two volumes is less than 20% relative to the smallest volume. Nevertheless, the phenomenon of damping can intervene for complementary windings which present a volume clearly different from that of the main volume, according to which one wishes to privilege the inertia of the mobile equipment, or conversely the degree of amortization.
- the son of the damping coil may be made of copper, that is to say in the same material as that of the main winding, or in another material such as aluminum or the like.
- a compromise can be found between weight gain through the use of a less dense conductor such as aluminum, and the resistance value of the conductor, depending on its resistivity and section.
- FIG. 1 is a sectional view of a speaker according to the invention.
- FIG. 2 is a sectional view of a detail of Figure 1;
- FIG. 3 is an electrical diagram showing the adjustment capacity of the loudspeaker according to the invention.
- FIG. 4 is a curve showing the impedance of the loudspeaker for different setting values of the resistance connected across the second winding.
- a loudspeaker 1 comprises, in the traditional way, a mobile unit composed of a membrane 2 to which is associated a winding 3 connected to the amplifier 10 delivering the electrical signal representative of the acoustic wave at generate.
- This coil 3 moves inside an area in which a constant magnetic field is generated, created by a field source which is generally a magnetized element 6, associated with pole pieces 7, 8, 9, so as to confining the field lines at winding 3 with a minimum air gap.
- a field source which is generally a magnetized element 6, associated with pole pieces 7, 8, 9, so as to confining the field lines at winding 3 with a minimum air gap.
- the loudspeaker comprises a second winding which, in the form shown, is covering the main winding, so as to be subjected to the same magnetic field.
- the main winding 3 is made by a winding of wires, typically of copper, of round section, whereas the winding 20 serving to modify the damping factor is made by a wire with a rectangular section. .
- This arrangement makes it possible not to excessively increase the air gap while maintaining a winding resistance as low as possible and a sufficient volume of copper.
- the principle of the invention also works with the use of other types of son, for example having cylindrical section, or made of similar materials such as aluminum.
- the damping winding 20 can be connected to different resistive elements 21-23.
- One of these elements can be a resistive element of very low value to simulate a short circuit to obtain maximum damping. It can also be a resistive element of average value which limits the current and is located on an intermediate value of the mechanical overvoltage coefficient (Qms). This value is calculated on a case-by-case basis, in order to obtain an intermediate level overvoltage coefficient value. Finally, this adjustment is made in the listening room, according to the user's perceptions and the level of reverberation of this place. It can also be done in the factory, as long as the geometrical parameters of the room where the loudspeaker will be installed are known.
- the number of connectable resistive elements may vary depending on the fineness of the adjustment that is desired. It is also possible for the damping coil 20 to be left in the air so as not to create an electromagnetic force, in which case the damping coil does not create an electromotive force so that the loudspeaker operates with these parameters.
- this adjustment can be done in various ways without departing from the principle of the invention, whether it is jumpers 24 as shown in Figure 3, or a multi-position wheel ensuring the connection of the resistance 21,22,23 appropriate.
- FIG. 4 An exemplary embodiment is illustrated in FIG. 4, in which the impedance of the loudspeaker as seen by the amplifier is plotted on the ordinate and the frequency is plotted on the abscissa, giving priority to the bass zone.
- the curve 41 which has the most marked peaks corresponds to an open circuit situation, an almost infinite resistance.
- the two peaks 42, 43 located in the neighborhood of 15 and 50 Hertz correspond to couplings between the loudspeaker and the vent as a function of the volume of the loudspeaker and the Thiele and Small parameters of the loudspeaker.
- Curve 45 corresponds to the intermediate current flow position in a 2.2 Ohms resistor which makes it possible to reduce the sound level between 50 and 100 Hz by -l, 5 dB, the factor Qms being divided by 8.
- the loudspeaker according to the invention has the advantage of being able to be adjusted so as to adjust its mechanical quality factor which has a very high resolution, including in the low register, and this with an easy-to-implement solution that makes it applicable to a wide range of speakers.
- the invention makes it possible to adjust the response of the acoustic enclosure to the listening room.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1054386A FR2961053B1 (fr) | 2010-06-04 | 2010-06-04 | Haut-parleur acoustique |
PCT/FR2011/000330 WO2011151546A1 (fr) | 2010-06-04 | 2011-06-03 | Haut-parleur acoustique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2577989A1 true EP2577989A1 (fr) | 2013-04-10 |
EP2577989B1 EP2577989B1 (fr) | 2014-03-26 |
Family
ID=43297165
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11730722.3A Active EP2577989B1 (fr) | 2010-06-04 | 2011-06-03 | Haut-parleur acoustique |
Country Status (4)
Country | Link |
---|---|
US (1) | US8917898B2 (fr) |
EP (1) | EP2577989B1 (fr) |
FR (1) | FR2961053B1 (fr) |
WO (1) | WO2011151546A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2022147835A (ja) * | 2021-03-23 | 2022-10-06 | ヤマハ株式会社 | 音響/信号変換器 |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1935404A (en) * | 1931-01-14 | 1933-11-14 | Telefunken Gmbh | Oscillating coil for electrodynamic loudspeakers |
US3766334A (en) * | 1971-11-15 | 1973-10-16 | A Burke | Double voice coil loudspeaker |
US3838216A (en) * | 1972-02-23 | 1974-09-24 | W Watkins | Device to effectively eliminate the motion induced back emf in a loudspeaker system in the region of fundamental acoustic resonance |
FR2382822B1 (fr) * | 1977-03-01 | 1985-08-30 | Seas Fabrikker As | Dispositif pour haut-parleur electrodynamique |
JPS5476132A (en) * | 1977-11-30 | 1979-06-18 | Hitachi Ltd | Electro-dynamic type speaker |
GB2010639B (en) * | 1977-12-14 | 1982-05-19 | Matsushita Electric Ind Co Ltd | Transducer |
US4335274A (en) * | 1980-01-11 | 1982-06-15 | Ayers Richard A | Sound reproduction system |
JPS5936689U (ja) * | 1982-08-31 | 1984-03-07 | パイオニア株式会社 | スピ−カ装置 |
DE19528904C1 (de) * | 1995-08-05 | 1997-04-10 | Michael Weidlich | Wandler zur Umwandlung von Wechselströmen in mechanische Bewegungen einer elastisch aufgehängten Masse |
US5828767A (en) * | 1997-09-22 | 1998-10-27 | Jbl Inc. | Inductive braking in a dual coil speaker driver unit |
DE19980741T1 (de) * | 1998-04-03 | 2000-07-20 | Sony Corp | Lautsprechervorrichtung |
JP4122602B2 (ja) * | 1998-11-19 | 2008-07-23 | ソニー株式会社 | スピーカー装置 |
JP2000333293A (ja) * | 1999-05-19 | 2000-11-30 | Sony Corp | スピーカ |
FR2799919B1 (fr) * | 1999-10-19 | 2002-10-11 | Sagem | Actionneur a aimant permanent et bobine electrique d'excitation, notamment haut-parleur de telephone mobile |
DE60324665D1 (de) * | 2002-01-25 | 2008-12-24 | Sonion Horsens As | Flexible membran mit integrierter spule |
US20050031151A1 (en) * | 2003-04-30 | 2005-02-10 | Louis Melillo | Speaker with adjustable voice coil impedance |
US7492918B2 (en) * | 2004-08-17 | 2009-02-17 | Step Technologies Inc. | Audio speaker with graduated voice coil windings |
US20060188120A1 (en) * | 2005-02-23 | 2006-08-24 | Michael Fisher | Multiple active coil speaker |
US7940950B2 (en) * | 2005-10-03 | 2011-05-10 | Youngtack Shim | Electromagnetically-shielded speaker systems and methods |
US20070183620A1 (en) * | 2006-02-07 | 2007-08-09 | Stiles Enrique M | Selectable impedance, constant efficiency electromagnetic transducer |
US8761433B2 (en) * | 2006-06-12 | 2014-06-24 | Harman International Industries, Incorporated | Variable impedance voice coil loudspeaker |
-
2010
- 2010-06-04 FR FR1054386A patent/FR2961053B1/fr active Active
-
2011
- 2011-06-03 WO PCT/FR2011/000330 patent/WO2011151546A1/fr active Application Filing
- 2011-06-03 EP EP11730722.3A patent/EP2577989B1/fr active Active
- 2011-06-03 US US13/701,307 patent/US8917898B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2011151546A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2961053A1 (fr) | 2011-12-09 |
FR2961053B1 (fr) | 2013-04-12 |
EP2577989B1 (fr) | 2014-03-26 |
WO2011151546A1 (fr) | 2011-12-08 |
US20130148841A1 (en) | 2013-06-13 |
US8917898B2 (en) | 2014-12-23 |
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